Electric power transmission for sewing machines



July 11, 195oy M. T. vom 2,514,461

ELECTRIC POWER TRANSMISSION FOR SEWING MACHINES Filed March 14, 1944 3 Sheets-Sheet l M. T. volGT 2,514,461

ELECTRIC POWER TRANSMISSION EoR SEWING MACHINES July 11, 1950 3 Sheets-Sheet 2 l Filed March 14, 1944 July 11, 1950 M. T. volGT 2,514,461

ELECTRIC POWER TRANSMISSION FOR SEWING MACHINESv Filed March 14, 1944 3 Sheets-Sheet 3 \\1\ \\%\\i l`\\ m a l, f' f Patented .uly 11, 1950 raar ortica ELECTRIC POWER, TRANSlWISSION FR,

SEWING MFACHINES Max T. Voigt.; Reading,v Pa. f

' Application March 14, 1944, Serial No.` 526,458

' The-principal objects of` the present invention arei toprovide means for tightening a driving beltusedf-to stop, start and drive a sewing machinepto-provide improved means for adjusting the brake device used to stop a sewing machine; to provide adraft of air for the comfort of the operator-for cooling the'needle and removing lint` and the like from the-work, table or both; and for air-cooling or Ventilating the transmission mechanism.

Other objects of the invention will appear from the following description at the end of which the invention will be claimed.

In the following description reference will be made to the accompanying drawings forming part hereof and in which:

Fig. 1 is a front View partly in section of mechanism embodying features of the invention and showing in dotted lines parts that would be concealed and which are shown in Fig. 4;

Fig. 2 is an end view with parts removed looking from right to left in Fig. 1;

Fig. 3 is an end view of the motor driven clutch element looking from left to right in Fig. l;

Fig. 4 is a sectional view illustrating upon an enlarged scale a portion of the motor housing and of the right hand end cover plate in Fig. l;

Fig. 5 is a sectional, diagrammatic or schematic view drawn to an enlarged scale and illustrating a modification; and

Fig. 6 is a view similar to Fig. 5 illustrating another modication.

Referring to the drawings, more particularly to Figs. 1 and 2, I is a bracket xedly depending from beneath the table a upon which a sewing machine, not shown, is mounted. 2 is a motor housing hinged at its periphery to the bracket. As shown the motor housing is provided with a lug 3 which is connected to the ends of the bracket by hinge pin ii or the like. 5 is a link pivoted at one end to the bracket at a point intermediate of its length and adjustably attached to an end portion of the housing at the other end for Varying its eiective length. The slot and bolt connection E is a means for adjustably connecting the link and housing and by means of it the housing can be turned about its ulcrum l so as to tighten and loosen the jointless or endless-belt b which transmits power to a sewing machine not shown. The sewing machine is stopped when the lever cis released and the spring d comes into action and shifts the driving clutch element f toward the right into contact with the brake ring g attached to the end cover plate of the motor housing. It is desirable that the clutch 1 Claim. (Cl. 248-16) element fand the partsV which itdrives, including the sewing machine, may be stopped-quickly or. at once. Therefore.- means are provided for` accurately adjustingvthe posi-tion of the brake ring i g attached to the endor head of the motor housing. For this purposey the head of cover 2a of the motor housing isiprovided with a flange 'i which slidably fits intox the open end ofthe cylindrical portion of the motor housing. The cover plate of the housing is secured thereto by lag screws 8. 9 indicates a nest of washers surrounding the lag screws 8 and interposed between the motor housing and the end cover so that by the addition or subtraction of one or more washers the position of the end plate and of the brake ring g which it carries can be accurately adjusted in respect to the driven clutch element and in this Way a quick or sudden clutch element stop is insured. The motor driven clutch element h is provided on its face with radially arranged vanes iii and in its rotation these vanes propel air from the inside to the outside through openings ll and there is a guard l2 arranged at the outside of the housing and it serves to deflect air as indicated by the arrow in Fig. 2 away from the operator, so that the operator While cooled is not subjected to an excessive draft.

Referring to Figs. 1 and 4, I4 indicates a movable or slidable shutter by means of which the size of the opening H may be increased or diminished, or the opening may be closed so that the operator can adjust the draft of air according to conditions or requirements.

As shown in Fig. 5, the vanes or fan blades ita are arranged on the driven clutch element f so that they are operative to produce a supply of air only when the clutch is in engagement and the sewing machine is in operation. The supply or draft of air thus produced is made available at the top of the table a, where it is directed toward the needle (not shown) and serves not only to cool the needle but also to remove dust, lint and the like. This purpose is accomplished by means of a hose or conveyor i3 which extends from the motor housing.

Referring to Fig. 6, the constantly rotating motor driven clutch element h is provided with vanes I0 and the driven, intermittently rotating element f is provided with vanes Ita so that the operator has available at all times a supply of air, which air isblown to cool the needle and remove lint only while the sewing machine is in operation.

When it is not desired to have a draft of air supplied above the table, use is made of a valve 3 I5 interposed in the air line I3 and diagrammatically illustrated in Fig. 6. This valve diagrammatically illustrated at I6 as well as the shutter I4 may be arranged for operation at any point convenient to the operator.

It will be obvious to those skilled in the art that modications may be made in details of construction and arrangement without departing from the spirit of the invention which is not limited in respect to such matters or otherwise than the appended claim may require.

I claim:

In a, power transmission apparatus of the character described, a motor drive assembly including a motor and a drive pulley associated therewith and adapted to be belt-connected to a` driven pulley, a bracket for supporting said motor assembly, said bracket including a, relatively fixed rigid member having a freely extending part to which said motor assembly is pivotally connected with the motor axis paralleling the axis of its pivotal support, a link pivotally connected to one side of said bracket at a point spaced from the pivotal connection of said motor assembly with said bracket, said link extending transversely of the motor axis for securement to one end of the motor at a point spaced vertically Vabove the motor axis and being provided 4 with an elongated slot in the region of its securement to said motor, and a stud projecting through the slot in said link and threaded into said end of the motor for locking the link to said motor, the eiective length of the link being varied accordingly as its slotted portion is shifted relatively to said locking stud whereby to maintain the motor drive in angularly adjusted position relatively to said bracket.

MAX 'l'. VOIGT.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 602,182 Preston et al Apr. 12, 1898 766,891 Newbold Aug 9, 1904 1,220,065 Blough Mar. 20, 1917 1,293,264 Waltz Feb. 4, 1919 1,756,576 Voigt Apr. 29, 1930 1,789,571 Wanamaker Jan. 20, 1931 2,082,738 Le Vesconte June 1, 1937 2,125,004 Hamerstadt July 26, 1938 2,144,326 Callaghan Jan. 17, 1939 2,234,310 Maybach Mar. 11, 1941 2,243,103 Knox May 27, 1941 

